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John.G 发表于 2012-8-20 14:29
check out this http://www.monitoringplus.co.nz/alarmvoip.php
我家的alarm也是刚换的新的,长得跟这个一样的。但是装的那个公司当时是直接连到电话线上的,装了一些什么filter之类的,据说更安全。还是觉得这样安全。
What's worse, even with the right settings, everything doesn't always go according to plan. When the alarm is communicating with the monitoring station, it's expecting all the right tones at the right time. The internet however, is not renowned for delivering data in a timely fashion. If you are surfing the web and you have to wait a tenth of a second longer for your web page to arrive, you'll probably not too concerned. But, a tenth of a second gap in a handshake tone can make all the difference to an alarm. This means you need to make sure you use a high quality VoIP provider and a good internet connection.
Monitoring Plus VoIP alarm reporting
Not many monitoring companies support VoIP as a method of alarm monitoring. This is because calls from your alarm to the monitoring company must be routed through your VoIP provided like any other phone call you make, leading to poor reliability (as discussed above).
Monitoring Plus takes a different approach, and uses a specialised VoIP server to communicate with your alarm. By connecting your alarm to the spare line of your ATA (or a separate ATA), and configuring it to connect directly to the Monitoring Plus server, the problems of call routing and transcoding are avoided. Also, by using a non-compressing codec and in-band DTMF signalling, high call quality is maintained. At our monitoring station, we use specialised DTMF detection algorithms that are specifically designed for communicating with alarm systems, avoiding the problems of missed digits.
On our burglar alarm phone wiring page we discuss the best way to connect ADSL broadband and burglar alarms. When connecting you alarm to Monitoring Plus VoIP monitoring, the set-up is a little different. With VoIP, the ATA output takes the place of the phone line entering your house, and phones are be connected to the first line. The second line output of the ATA (or a separate ATA) is configured to directly connect to the Monitoring Plus servers (and cannot be used for normal phone calls), and is connected to the alarm system only.
那个IP电话是连Fibre网络的,网络很快,但是有很多东西不能用。朋友家里用了说网速很快,但是家里电话经常不响,就是他自己打电话给家里,家里的电话不响的。所以我们还是没准备换,虽然价钱比我们现在便宜一半。还是再看看吧。如果家里不用alarm也不怎么用电话,用那个fibre超好,快还便宜 |
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